Starting from the plants of the fourth courtyard of Peking University, this book leads readers to step into the world of plants, where they pay attention to the plants around them, observe plants, record plants, and understand plants. The book introduces the terminologies used to describe plants, covering nomenclature, chirality, invasive species, plant ethics, and the relationship between human and plants. Readers are encouraged to get close to nature, explore plants, discover their stories, and gradually build their own nature archives, thus embarking on their own journey of natural history.  The book provides fresh materials for people to learn about plant species, plant protection and nature education. It also offers samples for nature fans to quickly familiarize themselves with unfamiliar environments and accurately identify local species.